https://www.crypto-coinz.net/crypto-calculator/ gives specs for the 1070ti

I got the Palit 1070ti Dual from aria.co.uk, though ebuyer.com had an asus one for a similar price IIRC.

You won't go wrong with a 1080 I don't think, it depends on what you intend to mine too, the 1070ti seems best mining neoscrypt coins where the 1080 struggles with it.

I haven't mined for 3 years, so take my advice with a pinch of salt